There is one with mauve-tinged pale pink flowers, that is very prolific. It self-seeds very profusely, even though I try to remove most of the seed pods before they mature.
There is also one with dark blue, almost purple flowers - which I prefer - but this one is less vigorous. Despite my attempts to favour this one over the pink one, the pink one still wins the battle for space!
In a shady corner next to my shed, where little else will grow, I have established a small patch of Convallaria Majalis (Lily Of The Valley).
The delicate white, bell-shaped flowers are very strongly scented. At this time of year I normally bring a small bunch of them indoors, where they impart a beautiful fragrance to the Living Room. If only the flowers had a longer season!